Consider a bright star in our night sky. Assume its distance from Earth is 48.7 light-years (ly) and its power output is 4.00 x 1028 w, about 100 times that of the Sun. (a) Find the intensity of the starlight at the Earth. 14.995 nW/m2 (b) Find the power of the starlight the Earth intercepts. One light-year is the distance traveled by the light through a vacuum in one year. (The radius of Earth is 6.37 x 106 m.) 7.646 Your response differs from the correct answer by more than 100%. MW

Consider a bright star in our night sky. Assume its distance from Earth is 48.7 light-years (ly) and its power output is 4.00 x 1028 w, about 100 times that of the Sun. (a) Find the intensity of the starlight at the Earth. 14.995 nW/m2 (b) Find the power of the starlight the Earth intercepts. One light-year is the distance traveled by the light through a vacuum in one year. (The radius of Earth is 6.37 x 106 m.) 7.646 Your response differs from the correct answer by more than 100%. MW

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter24: Electromagnetic Waves

Section: Chapter Questions

Problem 26P

See similar textbooks

Similar questions

A space probe 2.0 * 1010 m from a star measures the total intensity of electromagnetic radiation from the star to be 5.0 * 103 W/m2. If the star radiates uniformly in all directions, what is its total average power output?
The Sun emits electromagnetic waves equally in all directions. The intensity atEarth’s upper atmosphere is 1.4 Kw/m2. At what rate does the Sun emit electromagnetic waves? The average Earth-Sun distance is 1.50 × 1011 m(Hint: The totalpower output).
A 15.0 MHz magnetic field travels in a fluid in which the propagation velocity is 1.0x108 m/sec. The initial value is H(0,0)=2.0 ax A/m. The amplitude drops to 1.0 A/m after the wave travels 5.0 meters in the y direction. Find the general expression for this wave. Select one: a. H(y,t)=1e-0.14ycos(10π.106t-0.1πy) ax A/m b. H(y,t)=2e-0.14ycos(30π.106t-0.3πy) ax A/m c. None of these d. H(y,t)=2e-0.14ycos(10π.106t-0.1πy) ax A/m
Which of the following statements are true for electromagnetic waves traveling through a vacuum?a) All waves have the same wavelengthb) Al waves have the same frequencyc)The speed of the waves depends on their frequencyd) None of these
Which of the following statements are true regarding electromagnetic waves traveling through a vacuum? More than one statement may be correct. (a) All waves have the same wavelength. (b) All waves have the same frequency. (c) All waves travel at 3.00 × 108 m/s. (d) The electric and magnetic fields associated with the waves are perpendicular to each other and to the direction of wave propagation. (e) The speed of the waves depends on their frequency.
A space probe which is a distance of 1.9×1010 m from a star measures the total intensity of electromagnetic radiation from the star to be 5500 W/m^2 Part A If the star radiates uniformly in all directions, what is its total average power output?
The average intensity of solar radiation reaching Earth's satellite orbit is 1360 W/m?. A satellite's solar panel with area 37.7 m? directly faces the sun and absorbs the entire solar radiation incident on it. What is the force the solar radiation exerts on the panel (in Newton)? Speed of light in vacuum c = 3.008 m/s Permittivity of vacuum &0 = 8.85B-12 F/m Permeability of vacuum No = 1.26E-6 T•m/A
A satellite orbiting the earth in the upper atmosphere experiences a radiation pressure of 5.0 x 10-6 Pa due to light from the sun. What is the average intensity of sunlight at the location of the satellite? a. 2,000 watts/m2 b. 1,500 watts/m2 c. 1,000 watts/m2 d. 2,500 watts/m2 e. 3,000 watts/m2